Bosch is the first company by taking a MEMS accelerometer, magnetometer and gyroscope and putting them on a single die with a high speed ARM Cortex-M0 based processor to digest all the sensor data, abstract the sensor fusion and real time requirements away, and spit out data you can use in quaternions, Euler angles or vectors.
You can have meaningful sensor data in minutes thanks to the BNO055 - a smart 9-DOF sensor. You can read the data right over I2C.
Specifications
Absolute Orientation (Euler Vector, 100Hz) Three axis orientation data based on a 360° sphere
Absolute Orientation (Quaterion, 100Hz) Four point quaternion output for more accurate data manipulation
Angular Velocity Vector (100Hz) Three axis of 'rotation speed' in rad/s
Acceleration Vector (100Hz) Three axis of acceleration (gravity + linear motion) in m/s^2
Magnetic Field Strength Vector (20Hz) Three axis of magnetic field sensing in micro Tesla (uT)
Linear Acceleration Vector (100Hz) Three axis of linear acceleration data (acceleration minus gravity) in m/s^2
Gravity Vector (100Hz) Three axis of gravitational acceleration (minus any movement) in m/s^2
Temperature (1Hz) Ambient temperature in degrees celsius
Adafruit placed this very nice sensor on its own breakout, complete with 3.3V regulator, logic level shifting for the Reset and I2C pins, an external 32.768KHz crystal (recommended for best performance), and breakouts for some other pins you might find handy. Comes assembled and tested, with a small piece of header.
Note
Some soldering is required to attach the header to the breakout PCB
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Adafruit 9-DOF Absolute Orientation IMU Fusion Breakout - BNO055
The Grove - IMU 9DOF (lcm20600+AK09918) is a 9 Degrees of Freedom IMU (Inertial measurement unit) which combines a gyroscope, accelerometer and electronic compass.